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/*******************************************************************************
 * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
 *
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 *
 * The above copyright notice and this permission notice shall be included
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 */
#ifndef __MAX30205_H_
#define __MAX30205_H_

#include "mbed.h"

/**
 * @brief Library for the MAX30205\n
 * The MAX30205 temperature sensor accurately measures temperature and provide 
 * an overtemperature alarm/interrupt/shutdown output. This device converts the 
 * temperature measurements to digital form using a high-resolution, 
 * sigma-delta, analog-to-digital converter (ADC). Accuracy meets clinical 
 * thermometry specification of the ASTM E1112 when soldered on the final PCB. 
 * Communication is through an I2C-compatible 2-wire serial interface.
 *
 * @code
 * #include "mbed.h"
 * #include "max32630fthr.h"
 * #include "MAX30205.h"
 * 
 * MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
 *
 * //Get I2C instance
 * I2C i2cBus(I2C1_SDA, I2C1_SCL);
 *
 * //Get temp sensor instance
 * MAX30205 bodyTempSensor(i2cBus, 0x4D); //Constructor takes 7-bit slave adrs
 *
 * int main(void) 
 * {
 *     //use sensor
 * }
 * @endcode
 */

class MAX30205
{
    
public:
    /// MAX30205 Register Addresses
    enum Registers_e 
    {
        Temperature   = 0x00,
        Configuration = 0x01,
        THYST         = 0x02,
        TOS           = 0x03
    };
    
    ///MAX30205 Configuration register bitfields
    union Configuration_u
    {
        uint8_t all;
        struct BitField_s
        {
            uint8_t shutdown    : 1;
            uint8_t comp_int    : 1;
            uint8_t os_polarity : 1;
            uint8_t fault_queue : 2;
            uint8_t data_format : 1;
            uint8_t timeout     : 1;
            uint8_t one_shot    : 1;
        }bits;
    };
    
    /**
    * @brief  Constructor using reference to I2C object
    * @param i2c - Reference to I2C object
    * @param slaveAddress - 7-bit I2C address
    */
    MAX30205(I2C &i2c, uint8_t slaveAddress);

    /** @brief Destructor */
    ~MAX30205(void);

    /**
    * @brief Read the temperature from the device into a 16 bit value
    * @param[out] value - Raw temperature data on success
    * @return 0 on success, non-zero on failure
    */
    int32_t readTemperature(uint16_t &value);
    
    /**
    * @brief Read the configuration register
    * @param config - Reference to Configuration type
    * @return 0 on success, non-zero on failure
    */
    int32_t readConfiguration(Configuration_u &config);
    
    /**
    * @brief Write the configuration register with given configuration
    * @param config - Configuration to write
    * @return 0 on success, non-zero on failure
    */
    int32_t writeConfiguration(const Configuration_u config);

    /**
    * @brief Read the THYST value from a specified device instance
    * @param[out] value - THYST register value on success
    * @return 0 on success, non-zero on failure
    */
    int32_t readTHYST(uint16_t &value);

    /**
    * @brief Write the THYST to a device instance
    * @param value - 16-bit value to write
    * @return 0 on success, non-zero on failure
    */
    int32_t writeTHYST(const uint16_t value);
    
    /**
    * @brief Read the TOS value from device
    * @param[out] value - TOS register value on success
    * @return 0 on success, non-zero on failure
    */
    int32_t readTOS(uint16_t &value);

    /**
    * @brief Write the TOS register
    * @param value - 16-bit value to write
    * @return 0 on success, non-zero on failure
    */
    int32_t writeTOS(const uint16_t value);

    /**
    * @brief Convert a raw temperature value into a float
    * @param rawTemp - raw temperature value to convert
    * @return the convereted value in degrees C
    */
    float toCelsius(uint32_t rawTemp);

    /**
    * @brief Convert the passed in temperature in C to Fahrenheit
    * @param temperatureC Temperature in C to convert
    * @returns Returns the converted Fahrenheit value
    */
    float toFahrenheit(float temperatureC);
    
protected:

    /** 
    * @brief Write register of device at slave address
    * @param reg - Register address
    * @param value - Value to write
    * @return 0 on success, non-zero on failure
    */
    int32_t writeRegister(Registers_e reg, uint16_t value);

    /**
    * @brief  Read register of device at slave address
    * @param reg - Register address
    * @param[out] value - Read data on success
    * @return 0 on success, non-zero on failure
    */
    int32_t readRegister(Registers_e reg, uint16_t &value);

private:
    /// I2C object
    I2C & m_i2c;
    /// Device slave addresses
    uint8_t m_writeAddress, m_readAddress;
};

#endif /* __MAX30205_H_ */